Nonsense. There was never any such understanding. If the 2d used the term "weapons" there might be a scintilla of evidence for that interpretation.
Using the term "arms" limits the concept extensively.
Bull. That IS the standard understanding. The government has no rights, only powers (based on individual rights) granted by the people.
Uh, no, you are a drawing a distinction based on modern definitions that did not exist at the time the Constitution was framed.
The founders had just thrown-off their own tyrannical government. Why would they chose to form a new one and give it exclusive power to once again impose tyranny?